Aluminum-titanium doped silicon dioxide aerogel/fiber composite material and preparation method thereof

Abstract

The invention discloses an aluminum-titanium doped silicon dioxide aerogel / fiber composite material and a preparation method thereof. The preparation method comprises the following steps: taking and adding absolute ethyl alcohol, a hydrochloric acid solution, aluminum chloride hexahydrate and tetrabutyl titanate into a reaction kettle, weighing and slowly pouring ethyl orthosilicate into the reaction kettle, and stirring to obtain a sol; adding a gel accelerator, and continuously stirring to obtain a composite sol; impregnating a glass fiber felt in the composite sol, and flatly paving the impregnated glass fiber mat on a flat plate; putting the glass fiber felt impregnated with the composite sol into a plastic box, sealing, carrying out gel aging, and replacing the aged gel / glass fiber composite material with a solvent; and performing supercritical drying on the gel / glass fiber composite material. The strength and toughness of the aerogel can be enhanced while the heat insulation property of the aerogel is reserved, the high-temperature resistance of the silicon dioxide aerogel is improved through aluminum element doping, and the prepared aerogel / fiber composite material has verygood stability and heat insulation property.

Description

technical field

[0001] The invention relates to the field of high-temperature heat insulation materials, in particular to an aluminum-titanium-doped silica airgel / fiber composite material and a preparation method thereof. Background technique

[0002] With the construction, electronics, food, chemical and other manufacturing industries, as well as national defense and military industries, the requirements for thermal insulation materials are getting higher and higher. Silica airgel has a very high porosity, which can reach more than 90%. Its porous network three-dimensional structure effectively reduces the heat transfer between the gas phase and the solid phase, so it has excellent thermal insulation performance. National key industrial fields such as energy saving and aerospace have important application prospects. But it should be seen that pure SiO 2 Airgel is brittle, has poor mechanical properties, and the radiation thermal conductivity changes greatly when the tempe...

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